I suppose that this is a beginner's question; "Do theme changes affect the functionality of plug-ins already installed?".
WP promo type docs tend to say that a user can change themes easily and the same with plug-ins but are these really independent?
If one were starting from scratch, would one choose a theme before choosing plug-ins or vice versa? and once chosen, how disruptive might further changes be?
Thanks in advance for helping me along!